Add node modules and compiled JavaScript from main (#172)

Co-authored-by: Oliver King <oking3@uncc.edu>

node_modules/underscore/cjs/lastIndexOf.js

@@ -0,0 +1,8 @@
+var findLastIndex = require('./findLastIndex.js');
+var _createIndexFinder = require('./_createIndexFinder.js');
+
+// Return the position of the last occurrence of an item in an array,
+// or -1 if the item is not included in the array.
+var lastIndexOf = _createIndexFinder(-1, findLastIndex);
+
+module.exports = lastIndexOf;